Screw hoist



Feb. l0, 1931. y lw. G.-wE|DNER 1,792,339

scREwnoIsT Filed Sept. 10, 192'? 3 Sheets-Sheet l ATTO R N EY Feb. l0,1931. w. G. wElDNl-:R

SCREW HOIST Filed Sept. 10, 1927 3 Sheets-Sheet 2 l W a ATTORN EYPatented Feb. Y 10, 1931 SCREW Hofer application filed september 1e,i927.:V :semi npgziaeea',

The present invention relates to screw hoists and particularly to hoistsadapted for application to 'motor-trucks for raisingthe body of thetruck and dumping the same.

Objects of the invention are to improve hoists of this character and tomaintain an increase of efficiency thereof, while at the same timedecreasing the weight.

l ,Other objects are toprovide a hoist which may be made to operatefmoreswiftly in its downward movement than in Vits hoisting movement.

' Other objects are simplicity of construction, cheapness ofmanufacture, and ease of operation.

in the appended claim, and I do not wishv to be limited in the scope ofmy invention eX- cept as I sha-ll be limited by said-claim.

In the drawings: Y j Figure 1 is a section taken longitudinally throughthe center of the hoist casing. Y

Figure 2 is a. section on the line 2-.2 of Figure 1, showing the chaingear box yand gear connections therein.

Figure 3 isY a detail view showing oneofY the sprockets and its nut.

modification of the drive means for the screw operating nuts. f

j Figure 5 is a section at right angles to that shownvin Figure 47showing further the relationship of the gears shown in Figure 4.

designates a housing comprised of a center top brace member` 11 and alower brace member 12 connectedV at their ends to end housings. 13containing the screwoperating nuts. Sev 1 cured to the under side of thehousing 1U is a gear box 14 having journals 15 and 16 formedY therein toreceive and support the drive shaft 17 on which is mounted for rotationtherewith gears 18 and 19. A countershaft 2O also extends throughapertures in the gear box and is provided with journals 21 and 22,17 theupper end of said countershaft having a journaled support kin thecentral brace 11,V

as at 23.

vVithinithe gear box loosely Ymounted on A ,spe-@tively as illustra-'tedin Figure e. Still other `objects will appear `from the followingspecification and will be set forth Referring to the drawings infdetail7 10v A.train of gears 50551, 52, 53 andk54jconnecting saidcounter'sh'aftaregears l24e-and v25, said gearshaving clutch .cleats 26formed on their acl-jacent faces adapted to be "connected with K a:clutch V27 having vlongitudinal 'movement relative to tlie sha-ftQGfbt:being preif'en'ted; 55

Vfrom having 'rtry movement relative there# to by a longitudinal spline28 formedon the Vshaft land articulating with a corresponding groove 29vforinecl on thev inner. periphery ofA f said'vclutch'. Theclutch=maybe'moved along SG the shaft 20` to bring thefaces thereof into'cooperation `withthe *clutch "surfacesV 26 on either ef the gears- 24eine selectively. An dleiffinie'shs "vt/'ith' theges 18 and 24 resem-'eato ure Shaft for fearing a1-eee. aan taaie-@ated warmth@ teasing 1o are'Sprocketwheels-SO and 31 whieh are i driv, 'ing co'iinection tliiougli-sprocl'retV chains 4 Fand`35-7 with sprockets 32 andijBBseciredto"screw operating 'nutsy 36 and 37 journal'ed in the "end housings 13 and`..provided `with vthreaded bores 38 tof-fit andcooperate with liethreadedhoist Screws 39 Eland 40; the nuts :being preferably loiflbrassand the F16-wer ends fthereof resting on the Y:sheaves '41'of the ball,bearings thereof; 1 Figure 4 is a sectional view showing a 12:A whatfaeintafpe the rotation lThe enaheusiags are paridad at' the' "upf per,leads effen@ mas= with ena thrust 'eener-S brace connectiei by means ofstuds "eitendv 1,ngthroughVr apertured ears 45 and'k throughapertllresfiirsaldbrace connections; -An idler B5 46 maybe provided.withinth'e housing' 10 iup anylslack that may-develop in the sprocketchains 34. Y p

IVhile IKdeem a sprocket, chain connection between the countershaft andthel screw operating nuts asV preferable finV that it makes the devicemuch lighter and -ifs-more positive and sure in its operation, 'I-T'Inay-employa the countershaft 20 with on'eofrthe screw/ operating"nuts '86 through gears 51, and with the other screw operating-.nut37fthrough gears 51a and 52a.- The'nuts' and 37 areI Y i Vpreferablyrectangular` in crosssection, as'

WALTER G. wnrnnnn, or READING, .PENNsrLvaufra shown in Figure 4, .andthe sprockets Sand 33 are provided with bores therethroughcorresponding'tothe outer surfaces of the nuts,

whereby relative turning of the sprocket and the nut is prevented.

' In operation, when it is desired to usel'the above described device asa hoist, thesame is connected horizontally uponV the Vframe V of thetruck and the drive shaft 17 is preferably connected 'to a Vpower takecino-t shown,

through suitable gear or "chain connection.AV

The clutch 27 is then moved by means of the forked lever 47 pivota-llyattached to the clutch and pivoted at 48 in the side ofthe gear box, therelationship of the gears inV I the gear box-being such that when theclutch is connected for hoisting the movement will be much slower thanwhen it is connected for loweringlthe body of the truck.` I Vprefer a` irelationship suchthat will lower the body at a speed about threel timesas great as that employed in raising the same, It vwill be understoodthat in an emergency the body may be raised by this mechanism by hand. Y

Having described my invention, what I claimisf Y y Ina device of thecharacter described, upper and lower spaced parallel brace members, endhousings having spaced apertured lugs, bolts passed through the bracemembers and lugs lfor holding the end housings associated with the bracemembers, a counter shaft journaled in said brace members, sprocketscarrled by said shaft, screw voperating nuts journaled in the endhousings, sprockets thereon, endless chains. trainedV over the sprocketsof said screw operating nuts and over the sprockets ,onY said shaftagear boX secured to the lowermost brace member and receivingsaid shaft,gears loosely lmounted Y on the shaft and arranged in said gear boX, a

slidingclutchon thev shaft andicooperating p A with said gearsselectively, a second shaft journaled in the gear box inparallelism withthe first mentionedshaft, and gears on the second mentioned shaft, anidler lmeshing `with one kof thelast mentioned androne of theaforementioned gears,` each ofsaid screw operatingvnuts having aninternal threaded bore, and threaded shafts'extending throughv the boresfor the purpose specified.

In testimony whereof I` aX- my signature.

WALTER G; WEIDNER.

